CA2521541A1 - Rung-extension for ladder - Google Patents
Rung-extension for ladder Download PDFInfo
- Publication number
- CA2521541A1 CA2521541A1 CA002521541A CA2521541A CA2521541A1 CA 2521541 A1 CA2521541 A1 CA 2521541A1 CA 002521541 A CA002521541 A CA 002521541A CA 2521541 A CA2521541 A CA 2521541A CA 2521541 A1 CA2521541 A1 CA 2521541A1
- Authority
- CA
- Canada
- Prior art keywords
- rung
- ladder
- extension
- upper wall
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 210000002683 foot Anatomy 0.000 description 8
- 210000003423 ankle Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/16—Platforms on, or for use on, ladders, e.g. liftable or lowerable platforms
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/08—Special construction of longitudinal members, or rungs or other treads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
The rung-extension consists of frame having a pair of vertically extending supports and a number of vertically spaced treads which extend between the two supports. Hooks are provided for attaching the frame to a ladder such that the upper wall of each tread is at the same level as each rung of the ladder.
Description
FIELD OF THE INVENTION
This invention relates to an extension for the rungs of a ladder and more particularly to an extension having treads for increasing the area of the upper surface of the rungs of the ladder.
The term "rung" is intended to refer to the horizontal support of any ladder and to include not only what is commonly referred to as a "rung" but also a solid bar and a step of a stepladder.
BACKGROUND OF THE INVENTION
The rungs of most conventional ladders provide a relatively small area of contact for the feet of persons who are using the ladders. By reason of the small area, the feet of persons who spend relatively long periods of time on ladders such as painters and electricians become very painful over time. Such persons usually experience little relief from pain if they wear boots having stiff soles. While such boots may help to reduce or even eliminate pain in their feet and ankles, they will provide little if any relief to the lower and upper parts of their legs as wellas their backs and as a result, the legs of persons wearing such boots may become very painful over time.
The rung-extension of the subject invention has a number of treads which enlarge the upper areas of the rungs of a ladder. The feet of a person using a ladder to which the rung-extension is attached contact not only the rungs but also the treads of the rung-extension. The rung-extension provides foot-support which is substantially greater than the rungs and act to reduce or eliminate the pain which is experienced in the feet and legs of a person on a ladder which lacks such an extension.
Stepladders often provide inadequate support for the feet of persons on such ladders and the attachment of the subject invention is also useful for increasing the upper area of the steps of such ladders with resulting benefit to such persons.
The rung-extension of the invention has means for adjusting the device to fit onto both non-extendible and extendible ladders.
Briefly, the rung-extension of the subject invention comprises a frame provided with a tread having an upper wall for supporting a user's foot; and means for removably attaching the frame to the ladder such that the upper wall is in position to support the same said foot as is supported by a rung of the ladder.
DESCRIPTION OF THE DRAWINGS
The rung-extension of the invention is described with reference to the accompanying drawings in which:
Figure 1 is a perspective view of the rung-extension in conjunction with a conventional extendible ladder made up of two ladder-components;
Figure 2 is a perspective view of a the rung-extension in conjunction with a non-extendible ladder;
Figure 3 is an exploded perspective view of the rung-extension and a non-extendible ladder;
This invention relates to an extension for the rungs of a ladder and more particularly to an extension having treads for increasing the area of the upper surface of the rungs of the ladder.
The term "rung" is intended to refer to the horizontal support of any ladder and to include not only what is commonly referred to as a "rung" but also a solid bar and a step of a stepladder.
BACKGROUND OF THE INVENTION
The rungs of most conventional ladders provide a relatively small area of contact for the feet of persons who are using the ladders. By reason of the small area, the feet of persons who spend relatively long periods of time on ladders such as painters and electricians become very painful over time. Such persons usually experience little relief from pain if they wear boots having stiff soles. While such boots may help to reduce or even eliminate pain in their feet and ankles, they will provide little if any relief to the lower and upper parts of their legs as wellas their backs and as a result, the legs of persons wearing such boots may become very painful over time.
The rung-extension of the subject invention has a number of treads which enlarge the upper areas of the rungs of a ladder. The feet of a person using a ladder to which the rung-extension is attached contact not only the rungs but also the treads of the rung-extension. The rung-extension provides foot-support which is substantially greater than the rungs and act to reduce or eliminate the pain which is experienced in the feet and legs of a person on a ladder which lacks such an extension.
Stepladders often provide inadequate support for the feet of persons on such ladders and the attachment of the subject invention is also useful for increasing the upper area of the steps of such ladders with resulting benefit to such persons.
The rung-extension of the invention has means for adjusting the device to fit onto both non-extendible and extendible ladders.
Briefly, the rung-extension of the subject invention comprises a frame provided with a tread having an upper wall for supporting a user's foot; and means for removably attaching the frame to the ladder such that the upper wall is in position to support the same said foot as is supported by a rung of the ladder.
DESCRIPTION OF THE DRAWINGS
The rung-extension of the invention is described with reference to the accompanying drawings in which:
Figure 1 is a perspective view of the rung-extension in conjunction with a conventional extendible ladder made up of two ladder-components;
Figure 2 is a perspective view of a the rung-extension in conjunction with a non-extendible ladder;
Figure 3 is an exploded perspective view of the rung-extension and a non-extendible ladder;
2 Figure 4 is a side elevation of the rung-extension attached to a non-extendible ladder;
Figure 5 is a side elevation of the rung-extension attached to an extendible ladder having two ladder components;
Figure 6 is a front elevation of a second embodiment the rung-extension attached to a conventional non-extendible ladder having non-parallel side supports;
Figure 7 is an enlarged perspective view of the tread of the rung-extension of Figure 6;
and Figure 8 is a perspective view, in smaller scale, of a the rung-extension of Figure 6 having a number of treads.
Like reference characters refer to like parts throughout the description of the drawings.
DESCRIPTION OF PREFERRED EMBODIMENTS
With reference of Figure 1, the rung-extension of the invention, generally 10, is shown in conjunction with a conventional extendible ladder, generally 12 having two ladder-components l2a,b which slide relative to one another to lengthen or shorten the effective length of the ladder.
Each ladder-component has a number of vertically spaced rungs, bars or steps 14 (referred to below simply as "rungs") fixed between two horizontally spaced supports 16, 18.
With reference to Figures 2 and 3, the rung-extension consists of a pair of vertically extending stationary panels 20 and a pair of sliding panels 22 located outside the stationary panels. A number of vertically spaced treads 24 are fixed between the two stationary panels by means of bolts or rivets. Alternatively, the treads can be connected to the stationary panels by means of hinges 25, one of which is shown in Figure 2. Where hinges are used, a hinge is attached to the upper surface of each tread on the same side as hinge 25 and a like hinge is attached to the lower surface of each tread on the opposite side. The rung-extension can then be collapsed for storage when not in use by folding the two stationary panels together.
The two panels 20, 22 are interconnected by bolts 26, each of which extends through an aperture in the stationary panel and through a slot 28 in the sliding panel.
Heads 30 and wing nuts 32 at opposite ends of the bolts secure the bolts to the panels. By means of grooves 28, the elevation of the sliding panel can be adjusted relative to the stationary panel.
The treads may be bolted to the a hinge 33 may be provided With reference to Figures 3 and 4, each stationary panel has a number of horizontally extending grooves 34 which are spaced vertically along the length of the panel for receipt of the rungs 346 of the ladder 38. A hook 40 extends downwardly into the mouth 34a of each groove for contacting the front face 36a of the rung and preventing the rung-extension from sliding backward and separating from the ladder when the rung-extension is in contact with the ladder.
The sliding panel 22 has a front edge 42 which is spaced apart from each hook by a gap 44 of sufficient width to receive the rungs of the ladder when the extension is the position relative to the ladder illustrated in Figure 4. In that position the front edge 42 of the sliding panel contacts the rear face 36b of each rung and prevents the rung-extension from sliding forward relative to the rung. Accordingly, the hook and the front edge of the sliding panel cooperate with one another to minimize relative movement between the rung-extension and the rungs of the ladder when the ladder is in position for use.
With reference to Figure 5, the ladder, generally 50 is extendible and has forward and rear ladder-components, 52, 54 each having a number of rungs, 52a, 54a, respectively. As is convent-Tonal, the ladder is designed such that at each point at which the movement of one ladder-component is checked relative to the other, the rungs in each ladder-component are at approximately the same elevation as those of the other component.
In Figure 4, the gap 44 between the hook and forward edge of the sliding panel is only sufficient to accommodate one rung. In Figure 5, two rungs are accommodated in the gap and the space must be enlarged to accommodate them. The space may be enlarged by adjusting the position of the sliding panel relative to the stationary pane. In order to do so, wing nuts 60 are loosened to allow the sliding panel 62 to move downward relative to the stationary panel 64. It will be noted that the width 66 of the sliding panel, measured normally from its rear edge 68 to its forward edge 70 varies from a maximum in segment 70a of the edge to a minimum in segment 70b.. As the panel moves downward, the segment of the forward edge which faces hook 72 changes from its maximum as illustrated in Figure 4, to its minimum as illustrated in Figure 5.
When segment 70b faces hook 72, there is sufficient space to accommodate two rungs however the space is such that only minimal movement of the two rungs in the space is possible.
In Figures 6 and 8, the illustrated ladder, generally 80 has a pair of converging supports 82 to which a number of vertically spaced rungs 84 are affixed. The ladder is shown in conjunction with a second embodiment of the rung-extension of the invention, indicated generally 86. The latter extension has a pair of stationary panels 88 but lacks the sliding panels of the rung-extension described previously.
A number of vertically spaced treads 90 are attached to stationary panels 88.
The treads are shown in detail in Figure 7. With reference to that Figure and to Figure 8, the treads each have a central channel-shaped portion 92 which opens downwardly and defines a recess 94 for receipt of a plate 96 in each end. The plates slide in and out of the recesses in the direction of arrow 98. A pair of parallel slots 100 are formed in the plates for receipt of bolts 102 which pass through openings in the central portion 92. Wing nuts 104 are threadably attached to each bolt in order to tighten the plate to the central portion. The plate may accordingly be selectively prevented or allowed to slide relative to the central portion.
The ends of the central portion extend into elongated openings 106 formed in each stationary panel and are accordingly supported by the panels. With reference to Figure 6, the plates can be selectively extended to the converging supports 82 of the ladder in order to provide continuous treads for the user of the ladder to step on. It will be observed that the treads extend across the entire space between the two converging supports whether the treads are near the bottom of the ladder where the supports are relatively far apart or near the top where the supports are relatively close.
It sill be understood, of course, that modification can be made in the embodiments of the rung-extension of the subject invention without departing from the scope and purview of the invention as defined in the appended claims.
Figure 5 is a side elevation of the rung-extension attached to an extendible ladder having two ladder components;
Figure 6 is a front elevation of a second embodiment the rung-extension attached to a conventional non-extendible ladder having non-parallel side supports;
Figure 7 is an enlarged perspective view of the tread of the rung-extension of Figure 6;
and Figure 8 is a perspective view, in smaller scale, of a the rung-extension of Figure 6 having a number of treads.
Like reference characters refer to like parts throughout the description of the drawings.
DESCRIPTION OF PREFERRED EMBODIMENTS
With reference of Figure 1, the rung-extension of the invention, generally 10, is shown in conjunction with a conventional extendible ladder, generally 12 having two ladder-components l2a,b which slide relative to one another to lengthen or shorten the effective length of the ladder.
Each ladder-component has a number of vertically spaced rungs, bars or steps 14 (referred to below simply as "rungs") fixed between two horizontally spaced supports 16, 18.
With reference to Figures 2 and 3, the rung-extension consists of a pair of vertically extending stationary panels 20 and a pair of sliding panels 22 located outside the stationary panels. A number of vertically spaced treads 24 are fixed between the two stationary panels by means of bolts or rivets. Alternatively, the treads can be connected to the stationary panels by means of hinges 25, one of which is shown in Figure 2. Where hinges are used, a hinge is attached to the upper surface of each tread on the same side as hinge 25 and a like hinge is attached to the lower surface of each tread on the opposite side. The rung-extension can then be collapsed for storage when not in use by folding the two stationary panels together.
The two panels 20, 22 are interconnected by bolts 26, each of which extends through an aperture in the stationary panel and through a slot 28 in the sliding panel.
Heads 30 and wing nuts 32 at opposite ends of the bolts secure the bolts to the panels. By means of grooves 28, the elevation of the sliding panel can be adjusted relative to the stationary panel.
The treads may be bolted to the a hinge 33 may be provided With reference to Figures 3 and 4, each stationary panel has a number of horizontally extending grooves 34 which are spaced vertically along the length of the panel for receipt of the rungs 346 of the ladder 38. A hook 40 extends downwardly into the mouth 34a of each groove for contacting the front face 36a of the rung and preventing the rung-extension from sliding backward and separating from the ladder when the rung-extension is in contact with the ladder.
The sliding panel 22 has a front edge 42 which is spaced apart from each hook by a gap 44 of sufficient width to receive the rungs of the ladder when the extension is the position relative to the ladder illustrated in Figure 4. In that position the front edge 42 of the sliding panel contacts the rear face 36b of each rung and prevents the rung-extension from sliding forward relative to the rung. Accordingly, the hook and the front edge of the sliding panel cooperate with one another to minimize relative movement between the rung-extension and the rungs of the ladder when the ladder is in position for use.
With reference to Figure 5, the ladder, generally 50 is extendible and has forward and rear ladder-components, 52, 54 each having a number of rungs, 52a, 54a, respectively. As is convent-Tonal, the ladder is designed such that at each point at which the movement of one ladder-component is checked relative to the other, the rungs in each ladder-component are at approximately the same elevation as those of the other component.
In Figure 4, the gap 44 between the hook and forward edge of the sliding panel is only sufficient to accommodate one rung. In Figure 5, two rungs are accommodated in the gap and the space must be enlarged to accommodate them. The space may be enlarged by adjusting the position of the sliding panel relative to the stationary pane. In order to do so, wing nuts 60 are loosened to allow the sliding panel 62 to move downward relative to the stationary panel 64. It will be noted that the width 66 of the sliding panel, measured normally from its rear edge 68 to its forward edge 70 varies from a maximum in segment 70a of the edge to a minimum in segment 70b.. As the panel moves downward, the segment of the forward edge which faces hook 72 changes from its maximum as illustrated in Figure 4, to its minimum as illustrated in Figure 5.
When segment 70b faces hook 72, there is sufficient space to accommodate two rungs however the space is such that only minimal movement of the two rungs in the space is possible.
In Figures 6 and 8, the illustrated ladder, generally 80 has a pair of converging supports 82 to which a number of vertically spaced rungs 84 are affixed. The ladder is shown in conjunction with a second embodiment of the rung-extension of the invention, indicated generally 86. The latter extension has a pair of stationary panels 88 but lacks the sliding panels of the rung-extension described previously.
A number of vertically spaced treads 90 are attached to stationary panels 88.
The treads are shown in detail in Figure 7. With reference to that Figure and to Figure 8, the treads each have a central channel-shaped portion 92 which opens downwardly and defines a recess 94 for receipt of a plate 96 in each end. The plates slide in and out of the recesses in the direction of arrow 98. A pair of parallel slots 100 are formed in the plates for receipt of bolts 102 which pass through openings in the central portion 92. Wing nuts 104 are threadably attached to each bolt in order to tighten the plate to the central portion. The plate may accordingly be selectively prevented or allowed to slide relative to the central portion.
The ends of the central portion extend into elongated openings 106 formed in each stationary panel and are accordingly supported by the panels. With reference to Figure 6, the plates can be selectively extended to the converging supports 82 of the ladder in order to provide continuous treads for the user of the ladder to step on. It will be observed that the treads extend across the entire space between the two converging supports whether the treads are near the bottom of the ladder where the supports are relatively far apart or near the top where the supports are relatively close.
It sill be understood, of course, that modification can be made in the embodiments of the rung-extension of the subject invention without departing from the scope and purview of the invention as defined in the appended claims.
Claims (9)
1. A rung-extension for a ladder comprising: a frame provided with a tread having an upper wall for supporting a user's foot; and means for removably attaching said frame to said ladder such that said upper wall is in position to support the same said foot as is supported by a rung of said ladder.
2. The rung-extension of claim 1 wherein said attaching means is a hook associated with said frame for engaging said rung such that said upper wall is approximately at the same elevation as the area of said rung adapted to be contacted by said foot.
3. The rung-extension of claim 2 wherein said hook defines, in part, a gap of sufficient width to receive said rung; and means for selectively increasing the width of said gap.
4. A rung-extension for a ladder comprising: a frame having a plurality of spaced treads each having an upper wall for supporting a user's foot; and means for removably attaching said frame to a ladder such that each said upper wall is juxtaposed with one of a series of rungs of said ladder and is adapted to support the same said foot as is supported by said rung juxtaposed therewith.
5. The rung-extension of claim 4 wherein said attaching means is a hook associated with said frame for engaging each said rung such that each said upper wall is juxtaposed with a separate said rung.
6. The rung-extension of claim 4 further including means for extending the effective length of at least one of said upper walls.
7. A rung-extension for an extendible ladder having a pair of ladder-components each of which ladder-components having a pair of spaced supports and a plurality of rungs fixed between said supports, said rungs having an upper area adapted to be contacted by a foot of the user of said extendible ladder, said rung-extension comprising: a frame provided with a tread having an upper wall for supporting a user's foot; and means for removably attaching said frame to at least one of said ladder-components such that said upper wall is in position to support the same said foot as is supported by one of said rungs of said one ladder-component.
8. The rung-extension of claim 7 wherein said attaching means is a hook associated with said frame for engaging said one rung such that said upper wall is approximately at the same elevation as said area of said one rung.
9. The rung-extension of claim 8 wherein said hook defines, in part, a gap of sufficient width to receive said one rung; and means for selectively increasing the width of said gap to receive one of said rungs in the other said ladder component.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002521541A CA2521541A1 (en) | 2005-09-27 | 2005-09-27 | Rung-extension for ladder |
| US11/527,699 US20070068732A1 (en) | 2005-09-27 | 2006-09-27 | Rung-extension for ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002521541A CA2521541A1 (en) | 2005-09-27 | 2005-09-27 | Rung-extension for ladder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2521541A1 true CA2521541A1 (en) | 2007-03-27 |
Family
ID=37892489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002521541A Abandoned CA2521541A1 (en) | 2005-09-27 | 2005-09-27 | Rung-extension for ladder |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20070068732A1 (en) |
| CA (1) | CA2521541A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060272895A1 (en) * | 2005-06-01 | 2006-12-07 | Jeffrey Lavoie | Detachable stairway system for water vehicles and method of use |
| US9022172B2 (en) * | 2013-01-09 | 2015-05-05 | William Edward McCarthy | Ladder accessory |
| US10597941B2 (en) * | 2013-09-27 | 2020-03-24 | Wing Enterprises, Incorporated | Step ladders, components for step ladders and related methods |
| CA2868564C (en) * | 2014-10-17 | 2018-05-22 | City of Regina | Ladder holder |
| US10006248B2 (en) | 2015-05-27 | 2018-06-26 | Willow Step, Inc. | Step adapter for rung ladders |
| WO2016191531A1 (en) | 2015-05-27 | 2016-12-01 | Willow Step, Inc. | Step adapter for rung ladders |
| USD791972S1 (en) | 2016-05-26 | 2017-07-11 | Willow Step, Inc. | Step adapter for rung ladders |
| US9777535B1 (en) * | 2017-01-05 | 2017-10-03 | Stentiford Safety Services, Llc | Step adaptor for transitioning between sections of an extension ladder |
| US10532827B2 (en) * | 2017-05-31 | 2020-01-14 | Federal Express Corporation | Modular staircase |
| US10487579B2 (en) * | 2017-12-20 | 2019-11-26 | Invent 7, Llc | Ladder rung extension assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4241807A (en) * | 1978-11-17 | 1980-12-30 | MacStep Co., Inc. | Step attachment for ladders |
-
2005
- 2005-09-27 CA CA002521541A patent/CA2521541A1/en not_active Abandoned
-
2006
- 2006-09-27 US US11/527,699 patent/US20070068732A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20070068732A1 (en) | 2007-03-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |